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US3433740A
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Well fluid additive and method of making the same
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US3300984A
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Subterranean dam and method of making the same
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US3219111A
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Method for stopping loss of circulating fluid in well bores
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US3028913A
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Recovering lost circulation in wells
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US2836555A
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Material for recovering lost circulation in wells
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US2856354A
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Lost circulation recovering material
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US2683690A
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Material for recovering lost circulation in wells
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US2648522A
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Method of recovering lost circulation in wells
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US2626779A
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Method of recovering lost circulation occurring in production strata in wells
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US2670797A
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Gripper
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US2619179A
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Circulating unit and actuator therefor
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US2631670A
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Apparatus for handling fluid in a well
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US2670045A
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Liner hanger and actuator therefor
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US2616503A
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Circulation control for wells and actuator therefor
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US2634098A
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Means and method of recovering lost circulation in drilling wells
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US2642268A
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Method of recovering lost circulation in drilling wells
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US2481084A
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Cam operated transversely engaged clutch
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US2400186A
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Speed control drive
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US2372702A
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Speed control mechanism
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US2365794A
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Method and apparatus useful in repairing wells
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